Abstract
Light spectrum plays a crucial role in regulating the growth of hemp ( Cannabis sativa L.) plants and the biosynthesis of secondary metabolites. Several studies have demonstrated that additional red-light exposure increases biomass accumulation, while supplementary UV-A light stimulates cannabinoid synthesis. Nevertheless, the potential of stage-specific supplementation of red and UV-A light remains underexplored in its capacity to optimize cannabinoid yield in indoor hemp cultivation. In the present study, the effect of red light in combination with UV-A light on hemp biomass and cannabinoid accumulation was investigated using a high-CBD strain. There were four treatments: (1) white light throughout the growth period (control; V W R W ); (2) red light supplementation during the vegetative stage (V WR R W ); (3) UV-A supplementation (V W R WUV ) during the flowering stage; and (4) combined red and UV-A supplementation (V WR R WUV ) during the vegetative and flowering stages. Results showed that V WR R W promoted the number of effective branches (increased by 18.0%) compared to the control (V W R W ), resulting in an increase in inflorescence yield by 17.9%. V W R WUV increased CBG and CBD content by 52.7% and 12.1%, respectively, relative to the control. The effect of V WR R WUV on biomass and cannabinoid accumulation was the strongest among the treatments, with CBG and CBD yields reaching 0.53 g and 4.62 g per plant, representing significant increase of 91.8% ( p < 0.01) and 44.1% ( p < 0.01), respectively, compared to the control. However, there were no significant differences in CBD yield among the V WR R W , V W R WUV and V WR R WUV treatments, indicating that the combined supplementation of red and UV-A light did not have an additive effect on CBD accumulation. These findings highlight the potential of stage-specific spectral strategy to optimize both plant growth and phytochemical quantity.
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Claims 7
Claim · model-written summary
Red light during the vegetative stage increased the number of effective branches of hemp by 18.0% compared with white light control.
- Taxon
- hemp (Cannabis sativa L.)
Cannabis sativat0 - Treatment
- red light supplementation during the vegetative stagee2
- Outcome
- number of effective branchese1
- Direction
- increasede1
- Value
- 18.0%e1
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“enhances hemp (Cannabis sativa L.) inflorescence yield”
e1“V WR R W promoted the number of effective branches (increased by 18.0%) compared to the control (V W R W ), resulting in an increase in inflorescence yield by 17.9%”
e2“red light supplementation during the vegetative stage (V WR R W )”
Claim · model-written summary
Red light during the vegetative stage increased inflorescence yield of hemp by 17.9% compared with the control.
- Taxon
- hemp (Cannabis sativa L.)Cannabis sativat0
- Treatment
- red light supplementation during the vegetative stagee2
- Outcome
- inflorescence yielde1
- Direction
- increasee1
- Value
- 17.9%e1
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“enhances hemp (Cannabis sativa L.) inflorescence yield”
e1“V WR R W promoted the number of effective branches (increased by 18.0%) compared to the control (V W R W ), resulting in an increase in inflorescence yield by 17.9%”
e2“red light supplementation during the vegetative stage (V WR R W )”
Claim · model-written summary
UV-A supplementation during flowering increased CBG content by 52.7% relative to the control.
- Taxon
- hemp (Cannabis sativa L.)Cannabis sativat0
- Treatment
- UV-A supplementatione4
- Outcome
- CBGe3
- Direction
- increasede3
- Value
- 52.7%e3
- Comparator
- controle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“enhances hemp (Cannabis sativa L.) inflorescence yield”
e3“V W R WUV increased CBG and CBD content by 52.7% and 12.1%, respectively, relative to the control”
e4“UV-A supplementation (V W R WUV ) during the flowering stage”
Claim · model-written summary
UV-A supplementation during flowering increased CBD content by 12.1% relative to the control.
- Taxon
- hemp (Cannabis sativa L.)Cannabis sativat0
- Treatment
- UV-A supplementatione4
- Outcome
- CBDe3
- Direction
- increasede3
- Value
- 12.1%e3
- Comparator
- controle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“enhances hemp (Cannabis sativa L.) inflorescence yield”
e3“V W R WUV increased CBG and CBD content by 52.7% and 12.1%, respectively, relative to the control”
e4“UV-A supplementation (V W R WUV ) during the flowering stage”
Claim · model-written summary
Combined red and UV-A supplementation increased CBG yield by 91.8% relative to the control.
- Taxon
- hemp (Cannabis sativa L.)Cannabis sativat0
- Treatment
- combined red and UV-A supplementatione6
- Outcome
- CBGe5
- Direction
- increasee5
- Value
- 91.8%e5
- Comparator
- controle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“enhances hemp (Cannabis sativa L.) inflorescence yield”
e5“CBG and CBD yields reaching 0.53 g and 4.62 g per plant, representing significant increase of 91.8% ( p < 0.01) and 44.1% ( p < 0.01), respectively, compared to the control”
e6“combined red and UV-A supplementation (V WR R WUV ) during the vegetative and flowering stages”
Claim · model-written summary
Combined red and UV-A supplementation increased CBD yield by 44.1% relative to the control.
- Taxon
- hemp (Cannabis sativa L.)Cannabis sativat0
- Treatment
- combined red and UV-A supplementatione6
- Outcome
- CBDe5
- Direction
- increasee5
- Value
- 44.1%e5
- Comparator
- controle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“enhances hemp (Cannabis sativa L.) inflorescence yield”
e5“CBG and CBD yields reaching 0.53 g and 4.62 g per plant, representing significant increase of 91.8% ( p < 0.01) and 44.1% ( p < 0.01), respectively, compared to the control”
e6“combined red and UV-A supplementation (V WR R WUV ) during the vegetative and flowering stages”
Claim · model-written summary
Among the red and UV-A treatments there were no significant differences in CBD yield, and combined supplementation had no additive effect on CBD accumulation.
- Taxon
- hemp (Cannabis sativa L.)Cannabis sativat0
- Treatment
- combined supplementation of red and UV-A lighte7
- Outcome
- CBD yielde7
- Direction
- no significant differencese7
- Comparator
- V W R WUVe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“enhances hemp (Cannabis sativa L.) inflorescence yield”
e7“However, there were no significant differences in CBD yield among the V WR R W , V W R WUV and V WR R WUV treatments, indicating that the combined supplementation of red and UV-A light did not have an additive effect on CBD accumulation”
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See all 13 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.